AlamoFire Download in Background Session

Question

I am using Alamofire within a new app (A Download Manager Sample based on Alamofire) I need some clarifications about downloading files using the background session. I need

Answer 1

I was searching for the solution quite long. Until read the article mentioned above. The issue for me was - I had to enable External accessory communication

Everything else was done as described above. AppDelegate:

func application(_ application: UIApplication, handleEventsForBackgroundURLSession identifier: String, completionHandler: @escaping () -> Void) {
        BackendAPIManager.sharedInstance.backgroundCompletionHandler = completionHandler
    }

Singleton:

import Alamofire

class BackendAPIManager: NSObject {
    static let sharedInstance = BackendAPIManager()

    var alamoFireManager : Alamofire.SessionManager!

    var backgroundCompletionHandler: (() -> Void)? {
        get {
            return alamoFireManager?.backgroundCompletionHandler
        }
        set {
            alamoFireManager?.backgroundCompletionHandler = newValue
        }
    }

    fileprivate override init()
    {
        let configuration = URLSessionConfiguration.background(withIdentifier: "com.url.background")
        configuration.timeoutIntervalForRequest = 200 // seconds
        configuration.timeoutIntervalForResource = 200
        self.alamoFireManager = Alamofire.SessionManager(configuration: configuration)
    }
}

And the calls are done in the following way:

BackendAPIManager.sharedInstance.alamoFireManager.upload(multipartFormData: { (multipartFormData) in ...